165508393 has 4 divisors (see below), whose sum is σ = 168313680. Its totient is φ = 162703108.

The previous prime is 165508361. The next prime is 165508403. The reversal of 165508393 is 393805561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165508393 - 2⁵ = 165508361 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165568393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1402555 + ... + 1402672.

It is an arithmetic number, because the mean of its divisors is an integer number (42078420).

Almost surely, 2^165508393 is an apocalyptic number.

It is an amenable number.

165508393 is a deficient number, since it is larger than the sum of its proper divisors (2805287).

165508393 is an equidigital number, since it uses as much as digits as its factorization.

165508393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2805286.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 165508393 is about 12865.0065293415. The cubic root of 165508393 is about 549.0433983275.

It can be divided in two parts, 16 and 5508393, that added together give a square (5508409 = 2347²).

The spelling of 165508393 in words is "one hundred sixty-five million, five hundred eight thousand, three hundred ninety-three".